Emerson 610 installation manual Power Wiring

Wiring Considerations

7.1Power Wiring

1.Power wiring—rectifier input, bypass input, UPS output and battery cables—must be run in individual, separate conduits or cable trays. Refer to the Outline and Terminal Details drawings (Figures 14 through 30, 47, 49, 51, 53 and 75 through 78) for locations of the various power connections within the UPS and ancillary equipment. In particular, note the location of the rectifier input power connections.

! CAUTION

Power and control wiring must be separated!

2.Observe local, state and national electrical codes. Verify utility power and its overcurrent protection rating will accommodate the UPS input rating, including battery recharging.

3.A safety ground wire must be run from the building ground to a ground point in the UPS Module Cabinets, ancillary equipment and the Power-Tie Cabinet (if applicable). See 6.0 - Configuring Your Neutral and Ground Connections. The grounding conductor shall comply with the following conditions of installation:

a.An insulated grounding conductor must be sized in accordance with the NEC and local codes. It must be green (with or without one or more yellow stripes) and be installed as part of the branch circuit that supplies the unit or system.

b.The grounding conductor described above is to be grounded to earth at the service equipment or, if supplied by a separately derived system, at the supply transformer or motor-generator set in accordance with the instructions in 6.0 - Configuring Your Neutral and Ground Connections.

c.The attachment-plug receptacles in the vicinity of the unit or system are all to be of a grounding type, and the grounding conductors serving these receptacles are to be connected to earth ground at the service equipment.

4.Observe clockwise phase rotation of all power wiring. Phase A leads Phase B leads Phase C. A qualified electrician should check the phase rotation.

5.AC power cables must be rated to meet NEC requirements for voltage drop at the maximum rated system current. DC power cables from the UPS to the battery terminals and return must be sized for less than 2 volts total loop drop at the maximum rated system current.

6.If site equipment includes a backup generator and automatic transfer switch(es), consult the manufacturers of those devices for information on sizing and interfacing to the UPS system.

7.Removable access plates are available for power wiring. Refer to the Outline Drawings for your particular model (Figures 14, 16, 18, 20, 22, 24, 26, 28, 47, 49, 51, 53 and 75 through 78).

! CAUTION

After cutting holes in the access plates, be certain that no foreign matter (metal shavings, sawdust, insulation or wire fragments, etc.) remains inside the UPS. Likewise be certain to block any “extra” holes in the plates through which foreign matter could later enter the UPS.

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